The trouble is that a billion people speak Mandarin already and many of them speak very good English as well, so your own skillset as a second language learner isn't very likely to be valuable. Unfortunately learning any language is rarely a valuable market skill on its own.
The trouble is that a billion people speak Mandarin already and many of them speak very good English as well, so your own skillset as a second language learner isn't very likely to be valuable. Unfortunately learning any language is rarely a valuable market skill on its own.